The asymptotic structure of laminar, moderately rich, premixed methane flames is analyzed using a reduced chemical-kinetic mechanism comprising four global reactions. This reduced mechanism is different from those employed in previous asymptotic analyses of stoichiometric and lean flames, because a steady-state approximation is not introduced for CH3. The aim of the present analysis is to devel...

A numerical investigation of unsteady liquid fuel droplet combustion with droplet heating and internal circulation under forced convection is presented. The droplet is burning within an airstream at atmospheric pressure and under zero-gravity conditions. Combustion is modeled using finite rate kinetics and a one-step overall reaction. The numerical model includes a new multicomponent formulatio...

Abstract Introduction: Due to the high prevalence of type 2 diabetes and hypothyroidism and the fact that the complication of burning mouth syndrome is seen in both of these diseases, we compared the frequency of burning mouth syndrome in patients with diabetes mellitus type 2 and patients with hypothyroidism referred to Rasht dental school in 1399. Materials and Methods:In this cross-section...

The propagation of turbulent premixed flames influenced by the intrinsic hydrodynamic flame instability (the Darrieus-Landau instability) is considered in a two-dimensional case using the model nonlinear equation proposed recently by Bychkov [Phys. Rev. Lett. 84, 6122 (2000)]. The nonlinear equation takes into account both the influence of external turbulence and the intrinsic properties of a f...

An analytical model of a spreader-stoker wood waste fired boiler has been developed for pre­ dicting the size of the largest particle which can be entrained by the upward motion of the furnace gases. This model is based on an entrainment model which equates particle in-situ settling velocity to furnace gas velocity and uses a stirred reactor mod­ el to evaluate furnace conditions. The effects o...

We describe the latest developments of the Geneva stellar evolution code in order to model the pre– supernova evolution of rotating massive stars. Rotating and non–rotating stellar models at solar metallicity with masses equal to 12, 15, 20, 25, 40 and 60 M⊙ were computed from the ZAMS until the end of the core silicon burning phase. We took into account meridional circulation, secular shear in...

A somewhat limited number of computationally tractable methods of simulating turbulent premixed combustion currently exist. Most of these methods either directly or indirectly require information about how fast flames propagate in turbulent flow fields. In this work a dynamic model for describing turbulent burning velocities in the context of large eddy simulation (LES) is presented. This model...